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Income Before Income Taxes (Detail)
¥ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Income Loss From Continuing Operations Before Income Taxes Minority Interest By Jurisdiction [Abstract]        
PRC $ 3,394 ¥ 22,088 ¥ 18,194 ¥ 16,878
Non-PRC (124) (805) (3,685) 21,029
Income before income taxes $ 3,270 ¥ 21,283 ¥ 14,509 ¥ 37,907